Electric vehicle fire extinguishment system

Abstract

The present invention relates to an electric vehicle fire extinguishment system wherein, to overcome a fatal problem in which fire extinguishing is impossible, a direct setting action is performed inside a battery pack of an electric vehicle, and initial fire extinguishment is carried out simultaneously with battery combustion, and the combustion reaction between a battery and oxygen is completely blocked to actively prevent the spread of fire, thereby ensuring life safety and minimizing secondary property damage. More specifically, the present invention relates to an electric vehicle fire extinguishment system that detects an increase in temperature of multiple batteries disposed inside an electric vehicle battery pack, determines whether a fire has occurred on the basis of the detected temperature, generates a fire occurrence signal, ejects compressed carbon dioxide into the battery pack to block the combustion reaction between oxygen and the batteries, thereby extinguishing the fire, determines whether the fire has been extinguished through temperature detection after the carbon dioxide ejection, and when it is determined that fire extinguishment is impossible, injects a foam containing a fire-extinguishing agent dedicated to the electric vehicle from the outside of the battery pack into the battery pack to block the reaction between oxygen and the batteries.

Description

Electric vehicle fire suppression system

[0001] The present invention relates to an electric vehicle fire extinguishing system, and more specifically, to an electric vehicle fire extinguishing system that not only directly sets the action inside the battery pack of an electric vehicle to overcome the fatal defect of being unable to extinguish a fire, but also actively implements the spread of fire by completely blocking the combustion reaction between the battery and oxygen while simultaneously extinguishing the initial fire as the battery burns, thereby ensuring the safety of life and minimizing secondary property damage.

[0002]

[0003] The world is accelerating the energy transition by expanding investment in new and renewable energy with the goal of achieving carbon neutrality.

[0004]

[0005] Accordingly, the electric vehicle market is bound to grow structurally, as electric vehicles, which are essential for achieving global carbon neutrality, not only have a continuously increasing market value but also exhibit resilience to economic downturns.

[0006]

[0007] Meanwhile, electric vehicle batteries are composed of high-energy-density secondary batteries, and lithium-ion batteries are composed of four elements: a cathode, a positive electrode, a separator that blocks contact between the two electrodes, and an electrolyte that is a medium that helps the ions move smoothly.

[0008]

[0009] These batteries undergo a repetitive cycle of charging and discharging, allowing lithium ions to move from the anode to the cathode during charging and back to the anode during discharge. During charging, lithium ions are forced to migrate to the cathode, resulting in a chemically unstable state. This state is known to be most unstable when the battery is fully charged.

[0010] Fires are also most commonly identified at this time. "Thermal runaway" is also a common cause of lithium-ion battery fires.

[0011]

[0012] Thermal runaway occurs when heat is applied to the 'cells', the basic units of a battery, after a fire breaks out, causing the temperature to rise exponentially, eventually causing the cell to lose stability and release all the heat and chemical energy into the surroundings, making it difficult to extinguish.

[0013]

[0014] In recent years, the seriousness of battery fires in electric vehicles has been recognized, and interest in suppressing battery fires has increased.

[0015] For example, Patent No. 10-2664990 discloses a technical concept for an "Electric Vehicle Fire Suppression System." This technical concept relates to an electric vehicle fire suppression system capable of rapidly extinguishing fires that occur in electric vehicles parked in parking spaces. However, since achieving this goal requires a complete structural change to the parking space, questions are raised about its practical applicability and effectiveness.

[0016]

[0017] <Prior art literature>

[0018] (Patent Document 1) Patent Registration No. 10-2664990 (Published on May 9, 2024)

[0019]

[0020] The present invention was created to more actively resolve the above-mentioned problems, and its main purpose is to provide a highly efficient fire extinguishing system by directly injecting carbon dioxide and foam into the battery pack, which is the actual fire ignition area, to overcome the current problem of fire extinguishing being impossible using conventional methods.

[0021]

[0022] That is, the purpose of the present invention is to provide an electric vehicle fire extinguishing system that extinguishes an initial fire simultaneously with combustion of an electric vehicle battery and completely blocks the combustion reaction between the battery and oxygen to prevent the spread of fire, thereby minimizing the safety of life and secondary property damage.

[0023]

[0024] In order to achieve the above-mentioned problem, the electric vehicle fire extinguishing system proposed by the present invention is as follows.

[0025]

[0026] The present invention is characterized in that it detects a temperature rise of several batteries placed inside an electric vehicle battery pack, and then determines whether a fire has occurred based on the detected temperature and generates a fire occurrence signal so that compressed carbon dioxide is ejected inside the battery pack to block the combustion reaction between oxygen and the battery, and determines whether the fire has been extinguished through temperature detection after the carbon dioxide has been ejected, and if it is determined that the fire cannot be extinguished, it causes foam containing an electric vehicle-specific fire extinguishing agent inside the battery pack to block the reaction between oxygen and the battery pack.

[0027]

[0028] In addition, the present invention comprises a first suppression unit (100) that detects a temperature rise of several batteries placed inside a battery pack, determines whether a fire has occurred based on the detected temperature, generates a fire occurrence signal, and extinguishes the fire by injecting compressed carbon dioxide into the battery pack to block the combustion reaction between oxygen and batteries; and a second suppression unit (200) that detects the temperature after the carbon dioxide is emitted by the first suppression unit (100) to determine whether the fire has been extinguished by the first suppression unit (100), and injects a foam mixed with a chemical agent when it is determined that the fire cannot be extinguished; and is characterized in that it divides the fire into an initial suppression stage using carbon dioxide and a complete suppression stage using foam, and prevents the spread of the fire by blocking the combustion reaction between the batteries and oxygen.

[0029]

[0030] In addition, the first suppression unit (100) includes a first temperature detection unit (110) that detects a temperature rise of an electric vehicle battery, a fire detection unit (120) that determines whether a fire has occurred based on the temperature detected by the temperature detection unit (110) and generates a fire occurrence signal when a fire has occurred, and a carbon dioxide injection unit (130) that receives the fire occurrence signal of the fire detection unit (120) and causes compressed carbon dioxide to be injected into the electric vehicle battery pack.

[0031]

[0032] In addition, the second suppression unit (200) includes a second temperature detection unit (210) that detects a temperature rise of an electric vehicle battery; an extinguishing determination unit (220) that determines whether extinguishing has occurred by the first suppression unit (100) based on the temperature detected by the second temperature detection unit (210) and generates a extinguishing failure signal when extinguishing is not possible; and a foam spray unit (230) that sprays foam inside an electric vehicle battery pack upon receiving the extinguishing failure signal of the extinguishing determination unit (220) so that the foam is applied inside the battery pack.

[0033]

[0034] In addition, the foam injection unit (230) further includes a foam extinguishing unit (232) that is equipped to enable foam injection into the inside of an electric vehicle battery pack; a foam injection control unit (233) that receives a signal of inability to extinguish from the extinguishing determination unit (220) and controls the injection of foam received in the foam extinguishing unit (232); and a pressure control unit (234) that controls the pressure of the internal space of the electric vehicle battery pack when the foam extinguishing unit (232) operates.

[0035]

[0036] Meanwhile, the present invention may further include the following configuration.

[0037]

[0038] The above carbon dioxide injection unit (130) further includes a carbon dioxide unit (131) in which carbon dioxide is compressed and stored; and an injection control unit (132) that receives a fire occurrence signal and then causes the carbon dioxide contained in the carbon dioxide unit to be injected.

[0039]

[0040] In addition, the above evolution determination unit (220) is characterized by determining whether evolution has occurred based on the difference between the temperature detected by the first temperature detection unit (110) and the temperature detected by the second temperature detection unit (210).

[0041]

[0042] In addition, the pressure control unit (234) further includes a pressure hole unit (234a) formed in an electric vehicle battery pack and configured to open and close the internal space of the battery pack; and a pressure hole control unit (234b) that detects an increase in pressure in the internal space of the battery pack due to foam ejected from a foam extinguishing unit (232) and controls the opening and closing of the pressure hole unit (234a), so that the foam ejected inside the electric vehicle battery pack can be diffused.

[0043]

[0044] In addition, the first temperature detection unit (110) includes several sensor units (111) that detect the temperature of each of several batteries placed in an electric vehicle battery pack, and the fire determination unit (120) includes a fire zone setting unit (121) that identifies a battery whose temperature rises by the sensor unit (111) and sets a battery in which a sensor unit adjacent to the corresponding sensor unit is placed as a fire zone (A), thereby ensuring the effectiveness of initial detection and spread prevention by inducing fire extinguishment by causing carbon dioxide to be emitted in the set fire zone.

[0045]

[0046] According to the present invention having the above-described configuration, the initial fire can be extinguished by emitting carbon dioxide simultaneously with combustion of the electric vehicle battery, thereby fundamentally blocking the battery from entering the thermal runaway stage.

[0047] In addition, the present invention has the effect of minimizing the safety of life and secondary property damage by completely blocking the combustion reaction between the battery and oxygen by filling the inside of the battery pack with foam when the temperature does not decrease even with the emission of carbon dioxide, thereby blocking the spread of fire.

[0048]

[0049] Figure 1 is an example of an electric vehicle structure.

[0050] Figure 2 is a block diagram of the electric vehicle fire extinguishing system of the present invention.

[0051] Figure 3 is a detailed block diagram of the electric vehicle fire extinguishing system of the present invention.

[0052] Figure 4 is a block diagram according to an embodiment of an electric vehicle fire extinguishing system of the present invention.

[0053] Figure 5 is an example of setting a fire zone (A) of the fire zone setting unit (120) of the present invention.

[0054]

[0055] First, the advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. The present embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined solely by the scope of the claims. In addition, like reference numerals refer to like elements throughout the specification.

[0056]

[0057] The terms used throughout the specification of the present invention, which proposes a "system," have been selected from terms widely used and commonly used in the field, taking into account their functions in the present invention. However, these terms may vary depending on internal and external factors, such as the intentions of engineers working in the field, precedents, and the emergence of new technologies. Furthermore, the meaning of a specific word may encompass multiple concepts. Therefore, the terms used in the present invention should be interpreted as terms that reflect the overall technical content of the present invention, rather than simply a single concept of the term.

[0058] The terms "...unit" and the like described in the specification mean a unit that processes a single function or operation, which may be implemented by hardware or software, or a combination of hardware and software. It is self-evident that descriptions that are self-evident in the relevant technical field may be omitted in the description of the implementation of the operation, and that separate programming may be required.

[0059]

[0060] It should be noted that the present invention relates to an electric vehicle fire extinguishing system that not only directly sets the action inside the battery pack of an electric vehicle to overcome the fatal defect of being unable to extinguish a fire, but also actively implements the spread of fire by completely blocking the combustion reaction between the battery and oxygen while simultaneously extinguishing the initial fire as the battery burns, thereby minimizing the safety of life and secondary property damage.

[0061]

[0062] Fig. 1 is an exemplary diagram of an electric vehicle structure, Fig. 2 is a block diagram of an electric vehicle fire extinguishing system according to the present invention, Fig. 3 is a detailed block diagram of an electric vehicle fire extinguishing system according to the present invention, Fig. 4 is a block diagram according to an embodiment of an electric vehicle fire extinguishing system according to the present invention, and Fig. 5 is an exemplary diagram of a fire zone (A) setting of a fire zone setting unit (120) according to the present invention.

[0063]

[0064]

[0065] *Hereinafter, the configuration and operation effects of the present invention will be collectively described with reference to the drawings.

[0066]

[0067] As illustrated in Fig. 1, an electric vehicle (1) is a vehicle powered by electricity, and a battery pack (10) for storing electricity is configured on the lower part of the interior of the electric vehicle. The battery pack (10) includes several batteries and has a battery protection function. The batteries are installed inside the battery pack (10) and spaced apart from each other.

[0068] In the event of a fire in the battery built into such a battery pack (10), the battery pack tends to make it difficult to extinguish the fire due to the way the battery pack surrounds the battery.

[0069] Accordingly, the present invention is characterized in that it arranges a configuration capable of injecting carbon dioxide into the gap between batteries inside the battery pack (10) so that an initial fire-extinguishing operation can be immediately performed at the moment when a fire is expected to occur due to an abnormal temperature rise in the battery, and if the temperature rise continues despite the initial fire-extinguishing operation, it secondarily injects foam to completely block the combustion reaction due to oxygen, thereby extinguishing the fire before the battery reaches a state of thermal runaway.

[0070]

[0071] As illustrated in FIGS. 2 and 3, the present invention is characterized in that it detects a temperature rise of several batteries placed inside an electric vehicle battery pack, and then determines whether a fire has occurred based on the detected temperature and generates a fire occurrence signal so that compressed carbon dioxide is ejected inside the battery pack to block the combustion reaction between oxygen and the battery, and determines whether the fire has been extinguished through temperature detection after the carbon dioxide has been ejected, and when it is determined that the fire cannot be extinguished, it injects foam containing an electric vehicle-specific fire extinguishing agent from the outside of the battery pack into the battery pack to block the reaction between oxygen.

[0072]

[0073] More specifically, the present invention comprises a first suppression unit (100) that detects a temperature rise of several batteries placed inside a battery pack, determines whether a fire has occurred based on the detected temperature, generates a fire occurrence signal, and extinguishes a fire by injecting compressed carbon dioxide into the battery pack to block a combustion reaction between oxygen and the battery; a second suppression unit (200) that determines whether the fire has been extinguished by the first suppression unit (100) through temperature detection after the carbon dioxide has been emitted, and injects a foam containing a chemical compound from the outside to the inside of the battery pack when it is determined that the fire cannot be extinguished.

[0074] It is characterized by being divided into an initial stage using carbon dioxide and a complete stage using foam, and by preventing the spread of fire by blocking the combustion reaction between the battery and oxygen.

[0075]

[0076] The first suppression unit (100) includes a first temperature detection unit (110) that detects a rise in temperature of an electric vehicle battery; a fire detection unit (120) that determines whether a fire has occurred based on the temperature detected by the temperature detection unit (110) and generates a fire occurrence signal when a fire has occurred; and a carbon dioxide injection unit (130) that receives a fire occurrence signal from the fire detection unit (120) and causes compressed carbon dioxide to be injected into the electric vehicle battery pack.

[0077] The above first temperature detection unit (110) refers to a sensor that detects temperature.

[0078] The above fire determination unit (120) is linked to the first temperature detection unit (110) and has the purpose of determining whether a fire has occurred based on the temperature detected by the first temperature detection unit (110). A fire is determined by an abnormal rise in the temperature of the battery, and a fire can be determined if a sudden temperature rise of 100°C or more is detected. When a fire is determined, a fire signal is received by the carbon dioxide injection unit (130) so that compressed carbon dioxide can be injected into the battery pack (10).

[0079] The above carbon dioxide injection unit (130) further includes a carbon dioxide unit (131) in which carbon dioxide is compressed and stored; and an injection control unit (132) that, upon receiving a fire occurrence signal, causes carbon dioxide contained in the carbon dioxide unit to be injected.

[0080] The above carbon dioxide unit (131) may be configured to spray carbon dioxide, but is not limited to a specific format and any configuration is optional as long as it can realize a 'squirting' action.

[0081] The above-mentioned ejection control unit (132) is configured to eject compressed carbon dioxide stored in the carbon dioxide unit (131) based on a fire occurrence signal from the fire determination unit (120). At this time, the ejection control can be controlled to instantaneously trigger the carbon dioxide stored in the carbon dioxide unit (131) by employing the opening and closing of a valve or the airbag principle. For this purpose, a triggering configuration based on a valve or chemical reaction may be further included.

[0082]

[0083] If the temperature rise is not slowed or reduced despite the initial extinguishing action of the first suppression unit (100) as described above, the extinguishing action of the second suppression unit (200) is performed.

[0084]

[0085] The second suppression unit (200) includes a second temperature detection unit (210) that detects a temperature rise of an electric vehicle battery; an extinguishment determination unit (220) that determines whether extinguishment has been achieved by the first suppression unit (100) based on the temperature detected by the second temperature detection unit (210) and generates a extinguishment failure signal when extinguishment is not possible; and a foam spray unit (230) that sprays foam from the outside to the inside of the electric vehicle battery pack upon receiving the extinguishment failure signal from the extinguishment determination unit (220) so that the foam is applied to the battery.

[0086] The above second temperature detection unit (210) refers to a sensor that is provided in duplicate with or separately from the first temperature detection unit (110) and detects a temperature rise or decrease after the carbon dioxide is emitted from the first suppression unit (100).

[0087] The above-mentioned evolution determination unit (220) determines whether or not evolution has occurred based on the difference between the temperature detected by the first temperature detection unit (110) and the temperature detected by the second temperature detection unit (210). The difference in temperature here refers to the difference between the maximum temperature detected by the first temperature detection unit (110) due to the abnormal temperature rise of the battery and the temperature detected by the second temperature detection unit (210) after the carbon dioxide emission. If the temperature detected by the second temperature detection unit (210) is equal to or higher than the maximum temperature detected by the first temperature detection unit (110), it is determined that evolution is not possible and a growth failure signal can be generated.

[0088] The foam spray unit (230) receives a signal indicating that the fire cannot be extinguished generated by the fire detection unit (220), and sprays a foam containing a chemical agent onto the battery where the fire has broken out, thereby completely blocking the combustion reaction with oxygen. The sprayed foam is prepared in advance and may be composed of the same chemical agent as the foam contained and stored in a typical fire extinguisher. In addition, the foam spray unit (230) may be internally connected to the lower part of the electric vehicle, i.e., the interior of the battery pack (10).

[0089] Specifically, the foam injection unit (230) further includes a foam extinguishing unit (232) that is equipped to enable foam injection into the inside of an electric vehicle battery pack; a foam injection control unit (233) that receives a non-extinguishing signal from the extinguishing determination unit (220) and controls the injection of foam received in the foam extinguishing unit (232); and a pressure control unit (234) that controls the pressure in the internal space of the electric vehicle battery pack when the foam extinguishing unit (232) is in operation.

[0090] The above foam extinguishing unit (232) may be placed near the battery pack (10) and may be internally connected to the battery pack (10) so that foam can be sprayed into the battery pack, and a path for the foam to move may be provided.

[0091] The above foam discharge control unit (233) can control the foam extinguishing unit (232) to operate in response to a non-extinguishing signal so that foam can be discharged into the battery pack. This control is naturally performed by programming, and if there is another rapid rise in temperature after the first suppression unit (100), the foam extinguishing unit (232) can be controlled to operate simultaneously. For the discharge operation, the foam extinguishing unit (232) can be equipped with a valve, and the foam discharge control unit (233) can be configured to control the opening and closing of the valve.

[0092] The pressure control unit (234) further includes a pressure hole unit (234a) formed in an electric vehicle battery pack and configured to open and close the internal space of the battery pack; and a pressure hole control unit (234b) that detects an increase in pressure in the internal space of the battery pack due to foam ejected from a foam extinguishing unit (232) and controls the opening and closing of the pressure hole unit (234a), so that the foam ejected inside the electric vehicle battery pack can diffuse.

[0093] The steam discharge valve of the above pressure control unit (234) may be configured as a N / O (Normal Open) type. In other words, the pressure hole (234a) may be configured to be always closed and open when a fire occurs. For this purpose, the pressure hole control unit (234b) may need to receive a fire occurrence signal generated by the fire determination unit (120). In addition, the operation of the foam extinguishing unit (232) may be linked so that the pressure hole (234a) may be opened by the pressure hole control unit (234b), and the opening of the pressure hole (234a) enables rapid diffusion of the foam ejected inside the battery pack (10).

[0094]

[0095] The present invention may further include the following configuration.

[0096]

[0097] As illustrated in FIGS. 4 and 5, the first temperature detection unit (110) includes several sensor units (111) that detect the temperature of each of several batteries disposed in an electric vehicle battery pack, and the fire determination unit (120) may include a fire zone setting unit (121) that identifies a battery whose temperature rises by the sensor unit (111) and sets a battery in which a sensor unit adjacent to the corresponding sensor unit is disposed as a fire zone (A).

[0098] It is characterized by securing the effectiveness of initial detection and spread prevention by inducing fire extinguishment by causing carbon dioxide to be emitted into the fire zone set by the above fire zone setting unit (121).

[0099] If a fire breaks out in one of the several batteries built into a battery pack (10), the fire is likely to spread to nearby batteries. Therefore, by grouping the battery where the fire broke out and the batteries adjacent to it into a fire zone (A), and discharging carbon dioxide only to that group zone, the effectiveness of initial firefighting can be increased.

[0100] To this end, the fire zone setting unit (121) can assign a unique number to each sensor unit (111) and each battery detected by the sensor unit, and can group adjacent batteries and sensor units (111) with the unique number and set them as a fire zone (A).

[0101]

[0102] According to the present invention having the above-described configuration, the initial fire can be extinguished by emitting carbon dioxide simultaneously with combustion of the electric vehicle battery, thereby fundamentally blocking the battery from entering the thermal runaway stage.

[0103] In addition, the present invention has the effect of minimizing the safety of life and secondary property damage by completely blocking the combustion reaction between the battery and oxygen by filling the inside of the battery pack with foam when the temperature does not decrease even with the emission of carbon dioxide, thereby blocking the spread of fire.

[0104]

[0105] Although the above actions and effects, configurations, and operations have been described with reference to one embodiment illustrated in the drawings, this is merely exemplary, and it should be made clear that various modifications and equivalent other embodiments are possible for those skilled in the art. Therefore, the true technical protection scope of the present invention should be interpreted by the appended claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included within the scope of the rights of the present invention.

[0106]

[0107] < Explanation of symbols >

[0108] 100: First suppression unit 110: First temperature detection unit

[0109] 120: Fire detection section 130: Carbon dioxide emission section

[0110] 200: Second suppression unit 210: Second temperature detection unit

[0111] 220: Evolution determination section 230: Foam injection section

[0112] 232: Foam extinguishing unit 233: Foam ejection control unit

[0113] 234: Pressure control unit

Claims

1. A first suppression unit (100) that detects a temperature rise of several batteries placed inside an electric vehicle battery pack, and then determines whether a fire has occurred based on the detected temperature and generates a fire occurrence signal to extinguish the fire by injecting compressed carbon dioxide into the battery pack to block the combustion reaction between oxygen and the battery; and a second suppression unit (200) that determines whether the fire has been extinguished by detecting the temperature after the carbon dioxide has been emitted by the first suppression unit, and if it is determined that the fire cannot be extinguished, injects foam mixed with a chemical agent from the outside to the inside of the battery pack; and includes a stage of dividing the stage into an initial suppression using carbon dioxide and a complete suppression stage using foam, and preventing the spread of fire by blocking the combustion reaction between the battery and oxygen. The second suppression unit (200) above includes a second temperature detection unit (210) that detects a temperature rise of an electric vehicle battery; an extinguishing determination unit (220) that determines whether extinguishing is performed by the first suppression unit based on the temperature detected by the second temperature detection unit and generates a extinguishing failure signal when extinguishing is not possible; and a foam spray unit (230) that sprays foam from the outside to the inside of the electric vehicle battery pack upon receiving the extinguishing failure signal from the extinguishing determination unit so that the foam is applied to the inside of the battery pack. The foam spraying unit (230) comprises a foam extinguishing unit (232) that is provided to enable foam spraying into the inside of an electric vehicle battery pack; a foam spraying control unit (233) that receives a non-extinguishing signal from an extinguishing determination unit and controls the spraying of foam contained in the foam extinguishing unit; and a pressure control unit (234) that adjusts the pressure of an internal space of an electric vehicle battery pack when the foam extinguishing unit operates; wherein the pressure control unit (234) further comprises a pressure hole unit (234a) that is formed in an electric vehicle battery pack and is provided to enable opening and closing of the internal space of the battery pack; and a pressure hole control unit (234b) that detects an increase in pressure in the internal space of the battery pack due to foam sprayed from the foam extinguishing unit and controls opening and closing of the pressure hole unit.

2. In paragraph 1, The above first suppression unit (100) includes: a first temperature sensing unit (110) that detects a temperature rise of an electric vehicle battery; a fire detection unit (120) that determines whether a fire has occurred based on the temperature detected by the temperature sensing unit (110) and generates a fire occurrence signal when a fire is detected; and a carbon dioxide discharge unit (130) that receives the fire occurrence signal from the fire detection unit (120) and causes compressed carbon dioxide to be discharged into the electric vehicle battery pack. The above carbon dioxide ejection unit (130) further comprises a carbon dioxide unit (131) in which carbon dioxide is compressed and stored, and an ejection control unit (132) that causes the carbon dioxide contained in the carbon dioxide unit to be ejected after receiving a fire occurrence signal.

3. In paragraph 2, The above first temperature detection unit (110) includes several sensor units (111) that individually detect the temperature of several batteries placed in an electric vehicle battery pack, An electric vehicle fire extinguishing device comprising: a fire detection unit (120); a fire zone setting unit (121) that identifies a battery whose temperature rises by a sensor unit (111) and groups sensor units adjacent to the identified battery to set a fire zone (A), thereby allowing carbon dioxide to be emitted locally only in the set fire zone.

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